Explanation

A large SP indicates a higher spin potential.

For a given string installed in both the mains and crosses, spin potential is the ratio of the string-to-ball stickiness divided by the string-to-string slipperiness (string-to-ball COF / string-to-string COF). The higher the ratio, the greater the spin potential. If the string-to-string friction is low, the main strings will slide along the crosses and snap-back. If the string-to-ball friction is high, the strings will grab the ball during the snap-back. This combination adds incremental spin to the ball.

The ideal combination for a string is to have high string-to-ball friction and low string-to-string friction. However, this does not always apply to hybrids. How a string behaves with itself does not mean that it will behave similarly with a string of another material. For example, gut mains and crosses don't slide on each other. They have a high string-to-string COF. But gut mains on gut polyester crosses is the slipperiest combination of all.

The spin potential tool shows the net result of these two coefficients of friction. To see each coefficient separately, see the string friction tool.